Form clamp



Sept. 5, 1933. E w DlETRlC-H 1,925,689

FORM CLAMP Filed June 29, 1952 Patented Sept. 5, 1933 v l UNITED STATESPATENT OFFICE 1,925,689 FORM omitir Erich W. Dietrich, Chicago, Ill. YApplication June 29, 1932.` serial No. 619,352 3 claims. (ci. sst-a2) 'IThis invention relates. primarilyv to screw intermediate rod 4 locatedbetween the form threaded clamps, and is particularly adapted sides andthreaded to the inner endsof a pair of for use in connection withconcrete wall forms end bolts 5 which project outwardly through althoughit may be applied to many different the form. Improved nuts 6 aremounted on the 5 temporary fastenings. end bolts for engagement with thebattens. The 0 Certain typesA of form clamps, particularly .intermediaterod 4 is intended to be left embedsuch as are used for concrete wallforms, inded in the concrete wall, and the two end bolts clude a rodhaving its ends threaded for enare removed when the form is dismantled..gagement with nuts which secure the' form The inner ends of the bolts '5are tapered againstV spreading. The old type of nut hereslightly so asto facilitate removal of the bolts U5 tofore used for this purpose wasapplied and after the concrete has set. Each end bolt has a removed byrotating it in the well known manhelical rib 7 forming a thread in whichthe -teeth -ner.- Frequently, the rods project a considerare of lesswidth than. the intermediate spaces 8, able distance beyond the formsides' and, 'thereas clearly shown in Figs. 1 and 2.

` 15 fore, if nuts of the old type are used, much time The nut 6 has asubstantially ilat bearing face 70 is lost in the rotation of the nutswhen they 9 for engagement with the work. Formed on they are applied andremoved. Sometimes thousands nut, is a handle 10 which is preferablyoiset `of these clamps are used on a single wall and, from the plane ofthe bearingface 9, so as to in such cases, if some time is lost inapplying -permit the handle to be readily grasped in one and removingeach nut, the total wasted time in hand when being applied and removed.a If de- 75.

assembling and dismantlingeach form is consired, the handle may bomitted and the nut vk siderable. may be provided with t e usual sidefaces for The main vobjects of this invention are to prothe applicationof a wrench.

vide an improved nut or other screw threaded Formed in the nut is a pairof inter-communimember which is adapted to be shifted axially eatingopenings 11 and 12 for receiving the bolt. 80 "of the threaded rodwithout rotating eitherl the The opening 11 is unobstructed so that whenthe rod or nut, thereby permitting a quick rough bolt is in thisopening, the nut may be shifted adjustment of the nut; to provide a nutof this axially for a rough adjustment without any relakind which may berotated as an ordinary nut tive rotation of the parts. when it isdesired to obtain a fine adjustment; Formed in the opening 12 are spacedribs 13 85 and to provide an improved form of thread for forming aninterrupted thread for engagement a nut of this kind which will securethe nut with the rod. These ribs 13 are of less width against accidentaldisengagement from the bolt than the grooves 8 of the rod so as topermit a when the nut is in effective contact with the slight relativeaxial movement of the nut and a0 work. i 1 rod when lthe nut is notunder' pressure for the An illustrative embodiment of this inventionpurpose hereinafter described.v If the nut and is shown in theaccompanying drawing, whereybolt were provided with standard acmethreads, in: l without any locking means, it would be' possible Figure1f is a fragmentary vertical section for the nut to ,slip transverselyof the rod so as 9 40 `of a wall form, to which an improved temtodisengage the threads. It is for this reason porary fastening isapplied. thatvtemporary fastenings of this general type I Fig. 2 isl anenlarged fragmentary `axial Asecheretofore in use were not satisfactory.In my tion of the temporary fastening, part of the improvedconstructionI provide ylocking means rod being shown in elevation. within the nutwhich are adapted to positively l Fig. 3 is a perspective view of thenut. secure the nut against transverse movement Fig. 4 is a fragmentaryside view of the nut. when it isin effective engagement with the bolt.Fig. 5 ism. section, taken on the line 5-5 The' locking means compriseshoulders 14 0f Fig., 4. which are offset from the ribs 13 adjacent theFig.v 6 is a sectionvtaken on the' line 6 6 ends-thereof. Theseshoulders form stops which m5 of Fig. 4. 'Y restrict the throat of theopening 12 so as to In the particular construction herein. shown,.prevent the rod from entering the opening 11 the invention is appliedto a form clamp which as long as pressure is applied to the bearing faceis used in connection with a.l wall form com- 9. When the pressure isreleased, as, for inprising the usualv sides 1, studs 2 and battens 3.stance, when the nut is backed away from the no v5 The vform clampYherein shown comprises an a, work, the nut may be tilted, therebypermitting rod, it may be shifted axially without rotation.

as long as the rod is located within the opening 11. When the nut hasbeen shifted into engagement withithe batten 3 or other work, the nut isshifted transversely so as to bring the nut threads into engagement withthe threads on the rod. The nut is then rotated as an ordinary nut untilit rmly engages the work. The pressure of the work against the bearingface 9 causes the shoulders 14 to engage the threads of the rod, therebypreventing the nut from dropping out of threaded engagement with therod. As long as the nut occupies the position shown at the left handside of Fig. 1, there is no necessity for any locking means because thethreads of the nut are at the top. However, in the position shown at theright side of Fig. 1, the threads of the nut are at the bottom and,therefore, if no locking means were provided, vibration might cause thenut to drop so as to bring the rod into theopening 11 of the nut, inwhich case the nut would not be effective. I

To remove the nutit is necessary to first rotate it in a reversedirection soi as to move it away from the work, whereupon the vnut maybe tilted to disengage the shoulders 14 from the 1 threads of the rod.

It is to be understood that details of the con struction shown may bealtered or omitted without departing from the spirit of this inventionas dened by the following claims:

1. A clamp comprising a threaded rod, an time expansible nut having twointer-communicating openings either of which is adapted to receive saidLaaaeee rod from the other opening, one of said openings, beingunobstructed to permit axial adjustment of said nut without relativerotation of the parts, threads in the other ofl said openingsv forengagement with the rod threads, and a handle on said nut', said handleand threaded opening being 1o- Cated on diametrically opposite sides ofsaid unobstructed opening, the handle side of said nut being heavierthan the" threaded side. 1

2. A device of the class described comprising a threaded rod, a nuthaving an 'opening for receiving said rod, interrupted threads at oneside of said opening for engaging the threads on said rod, said openingbeing shaped to permit said nut to be shifted, transversely of said rodfor disengaging said threads to permit axial adjustment of said nutwithout relative rotation of the parts, and shoulders adjacent the endsof said interrupted threads adapted Vtovbe'shifted into engagement withvthe rod threads to secure said nut against movement transversely ofsaid rod.

3. A device ofthe class described. comprising a rod having a helical ribforming a thread, the teeth of said thread being of less width than theintermediate spaces, a nut having an opening for 10() receiving saidrod, and spaced ribs at one side of said opening arranged to form aninterrupted thread for engaging said rod thread, said opening beingshaped to permit said nut to be shifted transversely of said rod fordisengaging said threads to permit axial adjustment of said nut withoutrelative rotation of the parts, said nut ribs being provided with offsetshoulders adjacent p the ends thereof adapted to be shifted into enias

